*{
    margin: 0;
    padding: 0;
    font-size: 14px;
    font-family: "Microsoft YaHei";
    box-sizing:border-box ;
}
header, footer, section ,nav, article,aside{
    display: block;
}
a{
    text-decoration: none;
}
ul, li{
    list-style: none ;
}
img{
    border:0;
}